Supersonic-speed axisymmetric mixing layer wind tunnel

Abstract

The invention provides a supersonic-speed axisymmetric mixing layer wind tunnel which is characterized by comprising a transition section (1), a stabilization section (2) and a spray pipe experimental section (3), wherein the transition section is used for introducing an airflow; the stabilization section is provided with a first partition board (21) which divides the introduced airflow into two airflows; the spray pipe experimental section is connected at the downstream part of the stabilization section (2) and forms a fan-shaped axisymmetric structure relative to an axis (O) of revolution; the cross section of the peripheral wall of the spray pipe experimental section (3) is in a sector ring shape; a transparent window is formed on the peripheral wall; a spray pipe part (31) and a mixing experimental section (32) are formed on the spray pipe experimental section (3); and a second partition board (33) is arranged in the spray pipe part and the mixing experimental section is used for forming an axisymmetric mixing layer. By using the supersonic-speed axisymmetric mixing layer wind tunnel, the supersonic-speed axisymmetric mixing layer flow field of a totally-circular flow channel can be simulated and implementing the optical non-contact testing technology becomes convenient.

Description

technical field [0001] The invention relates to a wind tunnel, in particular to a supersonic axisymmetric mixed layer wind tunnel. Background technique [0002] The supersonic axisymmetric mixing layer refers to the flow field structure formed by the mixing of two coaxial high-speed airflows with different flow parameters in a free or confined space, which widely exists in scramjet engines, supersonic ejectors, high-speed missile air curtain cooling In flow fields such as windows and aerodynamic windows of high-energy lasers, the problems involved in flow stability, transition, vortex structure interaction, and turbulence are far more complicated than those in incompressible mixed layers, and related research needs to be carried out in depth. [0003] The wind tunnel is an important device for generating supersonic axisymmetric mixed layers. Due to the existence of instability, any slight disturbance at the boundary of the wind tunnel may change the flow field structure of ...

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Problems solved by technology

[0006] Therefore, there is a lack of wind tunnels dedicated to the study of axisymmetric mixed layers in the prior art; the coaxial jet device in the known technology has high turbulence, and the outlet is affected by the free atmosphere; in actual wind tunnel tests, the optical test environment is poor , which seriously affects the observation of the full flow field using optical non-contact testing techniques

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